In his first form its just like any battle. if you can keep your distance by using a great sword.
When he transforms, remember to dodge that is the key. Dodge all of his energy attacks. When he launches his blades, hit them singularly - not in a combo or you will get hit. When he does the rays rush in or you can't destroy them. All the while shoot your stunning orbs.
While not moving as soon as you get on the bike hold down the square button and gas at the same time. You will see steam come out of the back. As soon as this happens let go of the square and hit the gas. Your bike will pop a wheelie. It may only last a second, but it's pretty cool. You can do this repeatedly as long as your going.
To do this you have to be able to go larring city where the arena is. Go to register and do either Survival or Limit battle. Enter either one and get a party of whoever you want (i recommend Kuhn and Pi) Ok. You start the fight and wait till someone tries to use rengekai and counterattack and repeat this many time it didnt take me long to get my weapon lv to 10 (which is the limit on rebirth.) After you are done you can keep doing it over and over.
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